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Two substances are mixed together. Explain how the observer could determine if this reaction is just a mixture or an actual chemical reaction. Give an example of two reactants that would form a mixture and two reactants that would form a chemical reaction. (Lesson 7)
A chemist is trying to come up with a new solution-based battery for use in a new car. He chooses iron and zinc as the metals for his research and .
in the formula sodium phosphate na3po4 how many moles of sodium are represented? how many moles of phosphorus? how many
To determine the concentration of a 25.0 ml acetic acid solution (Ka for acetic acid is 1.8 X 10^-5), 25.0 ml of 2.00 M NaOH solution is used to reach the endpoint of titration. Calculate the pH of the endpoint.
What is the molecular formula of a gas that has a density of 1.88 g/L at STP? this is not the actual numbers but it would be nice to know how to do this.
White phosphorus is a molecular solid made of molecules of P4. A 3.88 g sample of white phosphorus starts at 24oC. Calculate the amount of heat (in J) required to melt the sample.
The second is defined as a fractional part of a mean solar day. Express one second as a fraction of a mean solar day based on your knowledge that there are 60 s in 1 min, 60 min in 1 h, and 24 h in one mean solar day.
A bioengineer preparing cells for a cloning experiment bathes a small piece of rat epithelial tissue in a TRIS buffer, (HOCH2)3CNH2. The buffer is made by dissolving 34.0 g TRIS (pKb = 5.91) in enough 0.075 M HCl to make 1.00 L of solution.
ice melts at 273.15K with delta H fusion = 6.01 kJ/mol. if the ice mass is 13.8 kg in a swimming pool whose temperature is held at 22.5 degree Celsius. What is the entropy change for melting the ice?
The temperature of the calorimeter rises by 25.4oC (Celsius). Specified that the energy of combustion (?E) for stearic is -40.5 kJ/g, compute the heat capacity of the bomb calorimeter. Make sure you enter kJ/C for your unit behind the number.
Calculate the heat in joules when 89.19 g of ice at 100.0 K is turned into liquid water at 10.0 degrees Celsius
A sample of aspirin to be purified has a mass of 1.0g. Aspirin has a solubility of 1.0g in 30ml of water at 37Celcius and a solubilty if 0.10g per 30 ml at 25 Celsius. The sample is dissolved in 30 ml of hot water and cooled to 25 Celcius. How muc..
Explain what is Urxn for the combustion of compound X. Define the hardware component of the calorimeter has a heat capacity of 3.69 kJ/C. The given heat of water is 4.184 J/g•C, and the MW of X is 56.0 g/mol.
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